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CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 38, Issue 12,2003, Pages 741-744, doi:10.3760/j.issn:0529-567X.2003.12.007
CHINESE JOURNAL OF OBSTETRICS AND GYNECOLOGY, Volume 38, Issue 12,2003, Pages 770-772, doi:10.3760/j.issn:0529-567X.2003.12.018
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